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Technology used for preparing methyl carbonate quaternary ammonium salt or ethyl carbonate quaternary ammonium salt using loop reaction device

A methyl carbonate and ethyl carbonate technology, which is applied in the preparation of organic carbonates, the preparation of amino compounds, sustainable manufacturing/processing, etc., can solve the problems of high energy consumption, poor mass transfer and heat transfer, etc. quality, reducing nitrogen consumption, increasing the effect of contact area

Active Publication Date: 2019-01-11
CHINA RES INST OF DAILY CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the patent ZL 201110307646.0, a method for preparing dialkyldimethyl quaternary ammonium salts using dimethyl carbonate as a quaternizing agent is disclosed, which solves the problem of using traditional toxic and harmful quaternizing agents, but the method is still The traditional tank-type stirred reactor has the problems of poor mass and heat transfer and high energy consumption

Method used

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  • Technology used for preparing methyl carbonate quaternary ammonium salt or ethyl carbonate quaternary ammonium salt using loop reaction device
  • Technology used for preparing methyl carbonate quaternary ammonium salt or ethyl carbonate quaternary ammonium salt using loop reaction device
  • Technology used for preparing methyl carbonate quaternary ammonium salt or ethyl carbonate quaternary ammonium salt using loop reaction device

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Experimental program
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Effect test

Embodiment 1

[0026] 40 kg of trimethyl tertiary amine and 61 kg of dimethyl carbonate were added to 200 L loop reactor 2, and the system was replaced with nitrogen 3 times to maintain the reaction pressure of the entire loop system at a nitrogen pressure of 0.01 MPa, and close the gas phase side Through the valve 24 and the gas phase inlet valve 25, the circulation pump 1 is turned on, and the loop circulation pump 1 sends it to the loop heat exchanger 9, and after being heated by the heat transfer oil, it reaches the Venturi reaction injector 5 at the top of the loop reactor 2 , enters the loop reactor 2 through injection to form a circulating flow, controls the injection flow rate to 10 m / s, and raises the temperature to 100 °C at the same time, at this time, the reaction pressure is 0.2 MPa. After reacting for 3.0 h, the loop is made When the reactor temperature drops to 95°C, the gas phase inlet valve 25 is opened, and the dimethyl carbonate vapor enters the condensation separation towe...

Embodiment 2

[0028] 50 kg of tributyl tertiary amine, 49 kg of dimethyl carbonate and 3.0 kg of methanol were added to the 200 L loop reactor 2, and the system was replaced with nitrogen to maintain the reaction pressure of the entire loop system at a nitrogen pressure of 0.01 MPa. Close the gas phase bypass valve 24 and the gas phase inlet valve 25, turn on the circulation pump 1, and transfer it to the loop heat exchanger 9 by the loop circulation pump 1, and reach the Venturi reaction at the top of the loop reactor 2 after being heated by the heat transfer oil. The injector 5 enters the loop reactor 2 through injection to form a circulating flow. The injection velocity is controlled to be 30 m / s, and the temperature is raised to 100 °C at the same time. At this time, the reaction pressure is 0.4 MPa. After 4.0 h of reaction, it passes through the external circulation heat exchanger 9 Make the loop reactor temperature drop to 95 DEG C, open the gas phase inlet valve 25, methanol and dimet...

Embodiment 3

[0030] Add 50 kg of dimethyloctyl tertiary amine, 113 kg of diethyl carbonate and 4.9 kg of methanol into the 200 L loop reactor 2, and replace the system with nitrogen to maintain the reaction pressure of the entire loop system at 0.01 MPa of nitrogen pressure, close the gas phase bypass valve 24 and the gas phase inlet valve 25, open the circulation pump 1, and transfer it to the loop heat exchanger 9 by the loop circulation pump 1, and reach the Venturi at the top of the loop reactor 2 after being heated by the heat transfer oil. The inner reaction injector 5 is injected into the loop reactor 2 to form a circulating flow. The injection flow rate is controlled to 40 m / s, and the temperature is raised to 140 ° C at the same time. At this time, the reaction pressure is 1.1 MPa. After 4.0 hours of reaction, the heat is exchanged through the external circulation Device 9 cools the loop reactor temperature to 130°C, opens gas phase inlet valve 25, methanol and diethyl carbonate va...

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Abstract

The invention discloses a technology used for preparing a methyl carbonate quaternary ammonium salt or an ethyl carbonate quaternary ammonium salt using a loop reaction device. According to the technology, tertiary amine, dimethyl carbonate or diethyl carbonate, and solvent methanol are introduced into a loop reactor; an external circulating pump is turned on, a mixture composed of tertiary amine,dimethyl carbonate or diethyl carbonate, and solvent methanol is pumped into an external circulating heat exchanger from the bottom of the loop reactor, the external circulating heat exchanger is used for heating the mixture to a reaction temperature, and the mixture is injected into the loop reactor using an injector for circulating reaction so as to obtain the methyl carbonate quaternary ammonium salt or the ethyl carbonate quaternary ammonium salt. No pollution is caused; mass transfer heat transfer efficiency is high; and energy consumption is low.

Description

technical field [0001] The invention belongs to a preparation process of a cationic surfactant, in particular to a process for preparing a loop reaction device in a loop reactor to prepare methyl carbonate quaternary ammonium salt or ethyl carbonate quaternary ammonium salt. technical background [0002] Quaternary ammonium cationic surfactants are an important class of organic chemicals with special properties, such as bactericidal, bacteriostatic, algicidal, mildew-proof, antistatic, soft and hydrophobic, etc., and have a wide antibacterial spectrum and high dosage It is widely used in various industrial sectors and fields, has developed rapidly and has become one of the basic industrial materials of the national economy. [0003] At present, the relatively mature production process for the preparation of quaternary ammonium salts at home and abroad is the direct quaternization reaction of alkyl tertiary amines and quaternizing agents (methyl halide, dimethyl sulfate) in a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C68/06C07C69/96C07C209/00C07C211/63
CPCC07C68/06C07C209/00C07C69/96C07C211/63Y02P20/10
Inventor 姜亚洁耿涛鞠洪斌王亚魁
Owner CHINA RES INST OF DAILY CHEM IND
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